Abstract
Ti3SiC2, as one of the most typical MAX ceramics, has been extensively studied as a potential high-temperature structural material. However, the restrictive relations between strength and toughness of Ti3SiC2 and Ti3SiC2-based materials have hampered their industrial applications. Herein, we reported the successful fabrication of Ti3SiC2–(Ti3SiC2–Cf) functionally graded materials (FGM) via hot-press sintering Ti3SiC2 and short Cf-derived preceramic papers. The microstructure evolution as well as the effect of sintering temperature on phase composition and interfacial reaction were investigated. Flexural strength and fracture toughness from ambient temperature to 1000 °C of the graded composites were determined to evaluate the mechanical performance. The results have shown that chemical reactions occurred between carbon fibers and Ti3SiC2 matrix, which leads to the formation of SiC interfaces with strong covalent bonds. The newly developed Ti3SiC2–(Ti3SiC2–Cf) graded composite materials exhibited excellent comprehensive performance as compared to that of monolithic Ti3SiC2. The flexural strength and fracture toughness of the graded composite at room temperature can be reached to 526 MPa and 7.46 MPa m1/2, respectively. However, there is no significant change in flexural strength and fracture toughness from RT to 1000 °C. The fracture micrographs also reveal that fiber breaking、pulling out and debonding are the primary mechanisms that contribute to the superior mechanical properties of composites. The exceptional performance demonstrated in Ti3SiC2–(Ti3SiC2–Cf) graded materials also makes them attractive choices for a variety of heatproof devices in aerospace sectors.
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